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Thread: Pressure switch

  1. #1
    Join Date
    Jul 2004
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    Pressure switch

    I have an underground cistern that has the typical set-up like a well. I have no problem when running the system(irrigation) and the pressure switch(40/60) cuts on and off fine. Overnight, even when not running the system, the pressure relief valve opens up and water drains out. The pressure shows 80psi and the relief valve opens at 75psi. Shouldn't the pressure switch keep that from happening or is is something else such as a problem with the pump.

    Thanks.

  2. #2
    Join Date
    Sep 2007
    Location
    edmonds wa
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    4,129
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    Is the tank bladder still good, sounds like maybe a expansion when it gets warm. Are we talking a lot of water out of the relief or just a little?
    UA Local 32

  3. #3
    Join Date
    Jul 2004
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    77
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    Thread Starter
    About a pint of water. The tank seems fine and is hollow when I tap it. If I turn the power off, I do not have the problem.

  4. #4
    Join Date
    Sep 2007
    Location
    edmonds wa
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    Bladder style pressure tank? if so i would verify the bladder still holds its air charge.
    UA Local 32

  5. #5
    Join Date
    Mar 2013
    Location
    Billington Heights, NY
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    21,628
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    i agree. It's likely not a pump or switch problem. Probably a failing pressure tank and the hot water tank heating causes the pressure to rise.

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